[MacPorts] #51401: Upgrade ffmpeg @2.8.6_2 to newer stable

[MacPorts]

#51401: Upgrade ffmpeg @2.8.6_2 to newer stable
--------------------------+----------------------
 Reporter:  and.damore@…  |      Owner:  devans@…
     Type:  update        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.3.4
 Keywords:                |       Port:  ffmpeg
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 ffmpeg has released 3.0 stable (possibly even 3.0.2), port ffmpeg should
 be bumped.

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Ticket URL: <https://trac.macports.org/ticket/51401>
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